U.S. patent application number 14/241049 was filed with the patent office on 2015-05-28 for color liquid crystal display panel and manufacturing method thereof.
This patent application is currently assigned to Shenzhen China Star Optoelectronics Technology Co. Ltd.. The applicant listed for this patent is Shenzhen China Star Optoelectronics Technology Co. Ltd.. Invention is credited to Xinhui Zhong.
Application Number | 20150146145 14/241049 |
Document ID | / |
Family ID | 53182401 |
Filed Date | 2015-05-28 |
United States Patent
Application |
20150146145 |
Kind Code |
A1 |
Zhong; Xinhui |
May 28, 2015 |
COLOR LIQUID CRYSTAL DISPLAY PANEL AND MANUFACTURING METHOD
THEREOF
Abstract
The present invention provides a color liquid crystal display
panel and a manufacturing method thereof. The color liquid crystal
display panel includes: a first substrate (2), a second substrate
(3), and dye-doped liquid crystal layers (4) hermetically sealed
between the first substrate (2) and the second substrate (3). The
dye-doped liquid crystal layers (4) each include a liquid crystal
material, a chiral dopant, and at least one dichroic dye. Each of
the dichroic dyes absorbs a light of a predetermined wavelength
range. The color liquid crystal display panel and the manufacturing
method thereof according to the present invention add at least one
dichroic dye in a liquid crystal material so as to use selective
absorbability of the dichroic dye with respect to visible lights to
adjust light intensity and also to achieve color displaying through
collaboration of a color filter and the dichroic dye, whereby there
is no need to include a conventionally used polarizer so as to
reduce the manufacturing cost of the color liquid crystal display
panel, also reduce the requirement for backlighting brightness,
enhance light transmittal and optical efficiency, and thus lower
down energy consumption of the operation of a color liquid crystal
display.
Inventors: |
Zhong; Xinhui; (Shenzhen,
CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Shenzhen China Star Optoelectronics Technology Co. Ltd. |
Shenzhen, Guangdong |
|
CN |
|
|
Assignee: |
Shenzhen China Star Optoelectronics
Technology Co. Ltd.
Shenzhen, Guangdong
CN
|
Family ID: |
53182401 |
Appl. No.: |
14/241049 |
Filed: |
December 2, 2013 |
PCT Filed: |
December 2, 2013 |
PCT NO: |
PCT/CN2013/088355 |
371 Date: |
February 25, 2014 |
Current U.S.
Class: |
349/106 ;
445/25 |
Current CPC
Class: |
G02F 1/1362 20130101;
G02F 2001/13706 20130101; G02F 1/13737 20130101; G02F 1/133514
20130101; G02F 1/1339 20130101 |
Class at
Publication: |
349/106 ;
445/25 |
International
Class: |
G02F 1/1335 20060101
G02F001/1335; G02F 1/1362 20060101 G02F001/1362; G02F 1/1368
20060101 G02F001/1368; G02F 1/1339 20060101 G02F001/1339 |
Foreign Application Data
Date |
Code |
Application Number |
Nov 28, 2013 |
CN |
201310625506.7 |
Claims
1. A color liquid crystal display panel, comprising: a first
substrate, a second substrate laminated on the first substrate, and
dye-doped liquid crystal layers hermetically sealed between the
first substrate and the second substrate, the dye-doped liquid
crystal layers each comprising a liquid crystal material, a chiral
dopant, and at least one dichroic dye, each of the dichroic dyes
absorbing a light of a predetermined wavelength range, the first
substrate comprising a first transparent substrate, a plurality of
gate lines formed on the first transparent substrate, and a
plurality of data lines formed on the first transparent substrate,
the second substrate comprising a second transparent substrate, a
black matrix formed on the second transparent substrate, and a
color filter arranged on the second transparent substrate at a
location corresponding to the black matrix, the black matrix and
the gate lines and the data lines collectively dividing the color
liquid crystal display panel into a plurality of pixels.
2. The color liquid crystal display panel as claimed in claim 1,
wherein the liquid crystal material is a positive nematic liquid
crystal material; the color filter comprises a red filter, a green
filter, and a blue filter juxtaposing each other; and the plurality
of pixels comprises: a plurality of red pixels, a plurality of
green pixels, and a plurality of blue pixels; the color liquid
crystal display panel further comprising a sealant frame arranged
on the second substrate and set on an edge of the second substrate
and electrically conductive resin arranged on the second substrate
and set outside the sealant frame.
3. The color liquid crystal display panel as claimed in claim 1,
wherein the first substrate is a thin-film transistor array
substrate and the first substrate further comprises an array of
thin-film transistors formed on the first transparent substrate, an
insulation layer formed on the array of thin-film transistors, the
data lines, and the first transparent substrate, pixel electrodes
formed on the insulation layer, a first planarization layer formed
on the pixel electrodes and the insulation layer, and a first
alignment layer formed on the first planarization layer; the second
substrate is a package substrate and the second substrate further
comprises a second planarization layer formed on the black matrix
and the color filter, a common electrode formed on the second
planarization layer, a second alignment layer formed on the common
electrode, and a spacer layer formed on the second alignment
layer.
4. The color liquid crystal display panel as claimed in claim 3,
wherein the first transparent substrate and the second transparent
substrate are both glass substrates, the pixel electrodes and the
common electrodes being both made of indium tin oxides, the first
alignment layer and the second alignment layer being both
horizontal alignment layers, the first alignment layer and the
second alignment layer realizing alignment by means of rubbing
alignment or photo alignment, the first alignment layer having an
alignment direction that defines an included angle with respect to
an alignment direction of the second alignment layer, the included
angle being greater than 0.degree. and less than 180.degree..
5. The color liquid crystal display panel as claimed in claim 4,
wherein the included angle defined between the alignment direction
of the first alignment layer and the alignment direction of the
second alignment layer is 90.degree..
6. A color liquid crystal display panel, comprising: a first
substrate, a second substrate laminated on the first substrate, and
dye-doped liquid crystal layers hermetically sealed between the
first substrate and the second substrate, the dye-doped liquid
crystal layers each comprising a liquid crystal material, a chiral
dopant, and at least one dichroic dye, each of the dichroic dyes
absorbing a light of a predetermined wavelength range, the first
substrate comprising a first transparent substrate, a plurality of
gate lines formed on the first transparent substrate, and a
plurality of data lines formed on the first transparent substrate,
the second substrate comprising a second transparent substrate, a
black matrix formed on the second transparent substrate, and a
color filter arranged on the second transparent substrate at a
location corresponding to the black matrix, the black matrix and
the gate lines and the data lines collectively dividing the color
liquid crystal display panel into a plurality of pixels; wherein
the liquid crystal material is a positive nematic liquid crystal
material; the color filter comprises a red filter, a green filter,
and a blue filter juxtaposing each other; and the plurality of
pixels comprises: a plurality of red pixels, a plurality of green
pixels, and a plurality of blue pixels; the color liquid crystal
display panel further comprising a sealant frame arranged on the
second substrate and set on an edge of the second substrate and
electrically conductive resin arranged on the second substrate and
set outside the sealant frame.
7. The color liquid crystal display panel as claimed in claim 6,
wherein the first substrate is a thin-film transistor array
substrate and the first substrate further comprises an array of
thin-film transistors formed on the first transparent substrate, an
insulation layer formed on the array of thin-film transistors, the
data lines, and the first transparent substrate, pixel electrodes
formed on the insulation layer, a first planarization layer formed
on the pixel electrodes and the insulation layer, and a first
alignment layer formed on the first planarization layer; the second
substrate is a package substrate and the second substrate further
comprises a second planarization layer formed on the black matrix
and the color filter, a common electrode formed on the second
planarization layer, a second alignment layer formed on the common
electrode, and a spacer layer formed on the second alignment
layer.
8. The color liquid crystal display panel as claimed in claim 7,
wherein the first transparent substrate and the second transparent
substrate are both glass substrates, the pixel electrodes and the
common electrodes being both made of indium tin oxides, the first
alignment layer and the second alignment layer being both
horizontal alignment layers, the first alignment layer and the
second alignment layer realizing alignment by means of rubbing
alignment or photo alignment, the first alignment layer having an
alignment direction that defines an included angle with respect to
an alignment direction of the second alignment layer, the included
angle being greater than 0.degree. and less than 180.degree..
9. The color liquid crystal display panel as claimed in claim 8,
wherein the included angle defined between the alignment direction
of the first alignment layer and the alignment direction of the
second alignment layer is 90.degree..
10. A manufacturing method of a color liquid crystal display panel,
comprising: (1) providing the first substrate, wherein the first
substrate is a thin-film transistor array substrate; (2) dropping a
mixture comprising a liquid crystal material, a chiral dopant, and
at least one dichroic dye on the first substrate to form dye-doped
liquid crystal layers, wherein each of the dichroic dyes absorbs a
light of a predetermined wavelength range; (3) providing a second
substrate, wherein the second substrate is a package substrate and
the second substrate comprises a second transparent substrate, a
black matrix formed on the second transparent substrate, and a
color filter arranged on the second transparent substrate and
corresponding to the black matrix; (4) coating a sealant on a
surface of the second substrate to form a sealant frame; (5)
coating an electrically conductive resin on the second substrate at
a location around and outside the sealant frame; and (6) laminating
the second substrate and the first substrate together in a vacuum
environment and subjecting the sealant frame to curing so as to
hermetically seal the dye-doped liquid crystal layers between the
first substrate and the second substrate.
11. The manufacturing method of the color liquid crystal display
panel as claimed in claim 10, wherein the liquid crystal material
is a positive nematic liquid crystal material; the color filter
comprises a red filter, a green filter, and a blue filter
juxtaposing each other; and in step (6), the sealant frame is
subjected to UV curing or thermal curing.
12. The manufacturing method of the color liquid crystal display
panel as claimed in claim 11, wherein the first substrate comprises
a first transparent substrate, a plurality of gate lines formed on
the first transparent substrate, a plurality of data lines formed
on the first transparent substrate, an array of thin-film
transistors formed on the first transparent substrate, an
insulation layer formed on the array of thin-film transistors, the
data lines, and the first transparent substrate, pixel electrodes
formed on the insulation layer, a first planarization layer formed
on the pixel electrodes and the insulation layer, and a first
alignment layer formed on the first planarization layer; and the
second substrate further comprises a second planarization layer
formed on the black matrix and the color filter, a common electrode
formed on the second planarization layer, a second alignment layer
formed on the common electrode, and a spacer layer formed on the
second alignment layer; the black matrix and the gate lines and the
data lines collectively dividing the color liquid crystal display
panel into a plurality of pixels, the plurality of pixels
comprising: a plurality of red pixels, a plurality of green pixels,
and a plurality of blue pixels.
13. The manufacturing method of the color liquid crystal display
panel as claimed in claim 12, wherein the first transparent
substrate and the second transparent substrate are both glass
substrates, the pixel electrodes and the common electrodes being
both made of indium tin oxides, the first alignment layer and the
second alignment layer being both horizontal alignment layers, the
first alignment layer and the second alignment layer realizing
alignment by means of rubbing alignment or photo alignment, the
first alignment layer having an alignment direction that defines an
included angle with respect to an alignment direction of the second
alignment layer, the included angle being greater than 0.degree.
and less than 180.degree..
14. The manufacturing method of the color liquid crystal display
panel as claimed in claim 13, wherein the included angle defined
between the alignment direction of the first alignment layer and
the alignment direction of the second alignment layer is
90.degree..
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to the field of liquid crystal
display technology, and in particular to a color liquid crystal
display panel and a manufacturing method thereof.
[0003] 2. The Related Arts
[0004] The continuous progress of the modern industry makes the
issues of energy shortage and environmental pollution more
prominent and these issues of environment and energy are attracting
increasing attention of people. It is now a problem to be faced by
all industries and businesses to develop and make products that is
more energy saving and more environmentally conservative. The
liquid crystal displaying industry is similarly facing the same
challenge. Thus, it has been a problem to be settled to develop
liquid crystal displays that are more energy saving and have
increased efficiency.
[0005] Liquid crystal displays (LCDs) have a variety of advantages,
such as thin device body, low power consumption, and being free of
radiation, and are thus widely used. However, it is publically
known that the liquid crystal displays are a passive optical device
and the liquid crystal material itself does not emit light. Thus,
most of the liquid crystal displays that are currently available in
the market are backlighting liquid crystal displays, which comprise
a liquid crystal display panel and a backlight module.
[0006] The liquid crystal display panel is generally used as an
optic switch element and a light intensity modulation element in
order to achieve the function of displaying an image and of which
the operation principle is that, with liquid crystal molecules
interposed between two parallel glass substrates, application of
electricity to the two glass substrates is selectively carried out
to control the liquid crystal molecules to change direction in
order to refract out light emitting from the backlight module for
generating images. A liquid crystal display panel is usually
composed of a color filter (CF) substrate, a thin-film transistor
(TFT) substrate, liquid crystal (LC) interposed between the CF
substrate and the TFT substrate, and a sealant and the
manufacturing process generally comprises: a front stage of array
process (including thin film, yellow light, etching, and film
stripping), an intermediate stage of cell process (including
laminating the TFT substrate and the CF substrate), and a rear
stage of module assembling process (including mounting of drive ICs
and printed circuit board). The front stage of array process
generally forms the TFT substrate in order to control the movement
of the liquid crystal molecules. The intermediate stage of cell
process generally introduces the liquid crystal between the TFT
substrate and the CF substrate. The rear stage of assembling
process generally integrates the drive ICs and combining the
printed circuit board to achieve driving of the liquid crystal
molecules to rotate for displaying images.
[0007] Referring to FIG. 1, which is a schematic view showing the
structure of a conventional color liquid crystal display panel, the
conventional color liquid crystal display panel generally
comprises, in a layer stacked arrangement from top to bottom, an
upper polarizer 100, a color filter substrate 110, a liquid crystal
layer 120, a thin-film transistor substrate 130, and a lower
polarizer 140, the layers being stacked, sequentially from top to
bottom, to constitute a display panel. To achieve full color
displaying, a common practice is to form a color filter on a glass
plate of a liquid crystal display panel (which is often a glass
plate that is set opposite to the glass plate of the thin-film
transistor substrate) to form a color filter substrate so as to
make use of the principle of spatial color mixture to fulfill full
color displaying.
[0008] However, some components of such a structure of color liquid
crystal display panel have extremely strong effects of absorption
and filtering of light. For example, the upper and lower polarizers
often filter off and absorb more than 55% light intensity, so that
light utilization of the conventional liquid crystal display panel
is extremely low, which is around 5-8%. Most of the energy of the
backlighting is wasted. With the trend of development of liquid
crystal displays toward high resolution, light utilization would
get even lower and the percentage of energy wasted would get even
higher.
SUMMARY OF THE INVENTION
[0009] An object of the present invention is to provide a color
liquid crystal display panel, which has a simple structure,
requires no inclusion of a polarizer, has a simple manufacturing
process, has low energy consumption, reduces the manufacture cost
of the color liquid crystal display panel, reduces the requirement
of backlighting brightness, and enhances light transmittal and
optical efficiency.
[0010] Another object of the present invention is to provide a
manufacturing method of a color liquid crystal display panel, which
simplifies the manufacturing process of a liquid crystal display
panel and lowers down the manufacturing cost of the liquid crystal
display panel and the liquid crystal display panel manufactured
therewith has a reduced requirement for backlighting brightness
thereby enhancing transmittal and optical efficiency and also
reducing energy consumption of operation thereof.
[0011] To achieve the above objects, the present invention provides
a color liquid crystal display panel, which comprises: a first
substrate, a second substrate laminated on the first substrate, and
dye-doped liquid crystal layers hermetically sealed between the
first substrate and the second substrate. The dye-doped liquid
crystal layers each comprise a liquid crystal material, a chiral
dopant, and at least one dichroic dye. Each of the dichroic dyes
absorbs a light of a predetermined wavelength range. The first
substrate comprises a first transparent substrate, a plurality of
gate lines formed on the first transparent substrate, and a
plurality of data lines formed on the first transparent substrate.
The second substrate comprises a second transparent substrate, a
black matrix formed on the second transparent substrate, and a
color filter arranged on the second transparent substrate at a
location corresponding to the black matrix. The black matrix and
the gate lines and the data lines collectively divide the color
liquid crystal display panel into a plurality of pixels.
[0012] The liquid crystal material is a positive nematic liquid
crystal material. The color filter comprises a red filter, a green
filter, and a blue filter juxtaposing each other. The plurality of
pixels comprises: a plurality of red pixels, a plurality of green
pixels, and a plurality of blue pixels.
[0013] The color liquid crystal display panel further comprises a
sealant frame arranged on the second substrate and set on an edge
of the second substrate and electrically conductive resin arranged
on the second substrate and set outside the sealant frame.
[0014] The first substrate is a thin-film transistor array
substrate and the first substrate further comprises an array of
thin-film transistors formed on the first transparent substrate, an
insulation layer formed on the array of thin-film transistors, the
data lines, and the first transparent substrate, pixel electrodes
formed on the insulation layer, a first planarization layer formed
on the pixel electrodes and the insulation layer, and a first
alignment layer formed on the first planarization layer. The second
substrate is a package substrate and the second substrate further
comprises a second planarization layer formed on the black matrix
and the color filter, a common electrode formed on the second
planarization layer, a second alignment layer formed on the common
electrode, and a spacer layer formed on the second alignment
layer.
[0015] The first transparent substrate and the second transparent
substrate are both glass substrates. The pixel electrodes and the
common electrodes are both made of indium tin oxides. The first
alignment layer and the second alignment layer are both horizontal
alignment layers. The first alignment layer and the second
alignment layer realize alignment by means of rubbing alignment or
photo alignment. The first alignment layer has an alignment
direction that defines an included angle with respect to an
alignment direction of the second alignment layer and the included
angle is greater than 0.degree. and less than 180.degree..
[0016] The included angle defined between the alignment direction
of the first alignment layer and the alignment direction of the
second alignment layer is 90.degree..
[0017] The present invention also provides a color liquid crystal
display panel, which comprises: a first substrate, a second
substrate laminated on the first substrate, and dye-doped liquid
crystal layers hermetically sealed between the first substrate and
the second substrate, the dye-doped liquid crystal layers each
comprising a liquid crystal material, a chiral dopant, and at least
one dichroic dye, each of the dichroic dyes absorbing a light of a
predetermined wavelength range, the first substrate comprising a
first transparent substrate, a plurality of gate lines formed on
the first transparent substrate, and a plurality of data lines
formed on the first transparent substrate, the second substrate
comprising a second transparent substrate, a black matrix formed on
the second transparent substrate, and a color filter arranged on
the second transparent substrate at a location corresponding to the
black matrix, the black matrix and the gate lines and the data
lines collectively dividing the color liquid crystal display panel
into a plurality of pixels;
[0018] wherein the liquid crystal material is a positive nematic
liquid crystal material; the color filter comprises a red filter, a
green filter, and a blue filter juxtaposing each other; and the
plurality of pixels comprises: a plurality of red pixels, a
plurality of green pixels, and a plurality of blue pixels;
[0019] the color liquid crystal display panel further comprising a
sealant frame arranged on the second substrate and set on an edge
of the second substrate and electrically conductive resin arranged
on the second substrate and set outside the sealant frame.
[0020] The first substrate is a thin-film transistor array
substrate and the first substrate further comprises an array of
thin-film transistors formed on the first transparent substrate, an
insulation layer formed on the array of thin-film transistors, the
data lines, and the first transparent substrate, pixel electrodes
formed on the insulation layer, a first planarization layer formed
on the pixel electrodes and the insulation layer, and a first
alignment layer formed on the first planarization layer. The second
substrate is a package substrate and the second substrate further
comprises a second planarization layer formed on the black matrix
and the color filter, a common electrode formed on the second
planarization layer, a second alignment layer formed on the common
electrode, and a spacer layer formed on the second alignment
layer.
[0021] The first transparent substrate and the second transparent
substrate are both glass substrates. The pixel electrodes and the
common electrodes are both made of indium tin oxides. The first
alignment layer and the second alignment layer are both horizontal
alignment layers. The first alignment layer and the second
alignment layer realize alignment by means of rubbing alignment or
photo alignment. The first alignment layer has an alignment
direction that defines an included angle with respect to an
alignment direction of the second alignment layer and the included
angle is greater than 0.degree. and less than 180.degree..
[0022] The included angle defined between the alignment direction
of the first alignment layer and the alignment direction of the
second alignment layer is 90.degree..
[0023] The present invention further provides a manufacturing
method of a color liquid crystal display panel, which
comprises:
[0024] (1) providing the first substrate, wherein the first
substrate is a thin-film transistor array substrate;
[0025] (2) dropping a mixture comprising a liquid crystal material,
a chiral dopant, and at least one dichroic dye on the first
substrate to form dye-doped liquid crystal layers, wherein each of
the dichroic dyes absorbs a light of a predetermined wavelength
range;
[0026] (3) providing a second substrate, wherein the second
substrate is a package substrate and the second substrate comprises
a second transparent substrate, a black matrix formed on the second
transparent substrate, and a color filter arranged on the second
transparent substrate and corresponding to the black matrix;
[0027] (4) coating a sealant on a surface of the second substrate
to form a sealant frame;
[0028] (5) coating an electrically conductive resin on the second
substrate at a location around and outside the sealant frame;
and
[0029] (6) laminating the second substrate and the first substrate
together in a vacuum environment and subjecting the sealant frame
to curing so as to hermetically seal the dye-doped liquid crystal
layers between the first substrate and the second substrate.
[0030] The liquid crystal material is a positive nematic liquid
crystal material. The color filter comprises a red filter, a green
filter, and a blue filter juxtaposing each other. In step (6), the
sealant frame is subjected to UV curing or thermal curing.
[0031] The first substrate comprises a first transparent substrate,
a plurality of gate lines formed on the first transparent
substrate, a plurality of data lines formed on the first
transparent substrate, an array of thin-film transistors formed on
the first transparent substrate, an insulation layer formed on the
array of thin-film transistors, the data lines, and the first
transparent substrate, pixel electrodes formed on the insulation
layer, a first planarization layer formed on the pixel electrodes
and the insulation layer, and a first alignment layer formed on the
first planarization layer. The second substrate further comprises a
second planarization layer formed on the black matrix and the color
filter, a common electrode formed on the second planarization
layer, a second alignment layer formed on the common electrode, and
a spacer layer formed on the second alignment layer.
[0032] The black matrix and the gate lines and the data lines
collectively divide the color liquid crystal display panel into a
plurality of pixels and the plurality of pixels comprises: a
plurality of red pixels, a plurality of green pixels, and a
plurality of blue pixels.
[0033] The first transparent substrate and the second transparent
substrate are both glass substrates. The pixel electrodes and the
common electrodes are both made of indium tin oxides. The first
alignment layer and the second alignment layer are both horizontal
alignment layers. The first alignment layer and the second
alignment layer realize alignment by means of rubbing alignment or
photo alignment. The first alignment layer has an alignment
direction that defines an included angle with respect to an
alignment direction of the second alignment layer and the included
angle is greater than 0.degree. and less than 180.degree..
[0034] The included angle defined between the alignment direction
of the first alignment layer and the alignment direction of the
second alignment layer is 90.degree..
[0035] The efficacy of the present invention is that the present
invention provides a color liquid crystal display panel and a
manufacturing method thereof, wherein at least one dichroic dye is
added in a liquid crystal material so as to use selective
absorbability of the dichroic dye with respect to visible lights to
adjust light intensity and also to achieve color displaying through
collaboration of a color filter and the dichroic dye, whereby there
is no need to include a conventionally used polarizer so as to
reduce the manufacturing cost of the color liquid crystal display
panel, also reduce the requirement for backlighting brightness,
enhance light transmittal and optical efficiency, and thus lower
down energy consumption of the operation of a color liquid crystal
display.
BRIEF DESCRIPTION OF THE DRAWINGS
[0036] The technical solution, as well as other beneficial
advantages, of the present invention will be apparent from the
following detailed description of embodiments of the present
invention, with reference to the attached drawing. In the
drawing:
[0037] FIG. 1 is a schematic view showing the structure of a
conventional color liquid crystal display panel;
[0038] FIG. 2 is a schematic view showing the structure of a color
liquid crystal display panel according to the present
invention;
[0039] FIG. 3 shows a diagram of an equivalent circuit of a first
substrate of FIG. 2;
[0040] FIG. 4 is a top plan view of a second substrate of FIG.
2;
[0041] FIGS. 5 and 6 are schematic views demonstrating the
principle of color displaying with the color liquid crystal display
panel according to the present invention; and
[0042] FIG. 7 is a flow chart illustrating a manufacturing method
of a color liquid crystal display panel according to the present
invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0043] Referring to FIGS. 2-4, the present invention provides a
color liquid crystal display panel, which comprises: a first
substrate 2, a second substrate 3 laminated on the first substrate
2, and dye-doped liquid crystal layers 4 hermetically sealed
between the first substrate 2 and the second substrate 3.
[0044] As shown in FIGS. 2 and 3, the first substrate 2 is a
thin-film transistor array substrate. The first substrate 2
comprises a first transparent substrate 21, a plurality of gate
lines 22 formed on the first transparent substrate 21, a plurality
of data lines 23 formed on the first transparent substrate 21, an
array of thin-film transistors 25 formed on the first transparent
substrate 21, an insulation layer 24 formed on the array of
thin-film transistors 25, the data lines 23, and the first
transparent substrate 21, pixel electrodes 26 formed on the
insulation layer 24, a first planarization layer 27 formed on the
pixel electrodes 26 and the insulation layer 24, and a first
alignment layer 28 formed on the first planarization layer 27.
[0045] The first transparent substrate 21 can be a glass substrate
or a plastic substrate and is preferably a glass substrate in the
instant embodiment.
[0046] The thin-film transistors each 25 comprises a gate terminal
g, a source terminal s, and a drain terminal d. The gate terminals
g are electrically connected to the gate lines 22. The source
terminals s are electrically connected, through vias, to the data
lines 23. The drain terminals d are electrically connected to the
pixel electrodes 26. The pixel electrodes 26 are preferably made of
indium tin oxides (ITO). The first alignment layer 28 is a
horizontal alignment layer and the first alignment layer 28
realizes alignment by means of rubbing alignment or photo
alignment. The gate lines 22 and the pixel electrodes 26 partially
overlap each other to form storage capacitors C.sub.st. The pixel
electrodes 26, the first planarization layer 27, and the first
alignment layer 28 are all formed by means of masking
processes.
[0047] As shown in FIGS. 2 and 4, the second substrate 3 is a
package substrate, the second substrate 3 comprises a second
transparent substrate 31, a black matrix 32 formed on the second
transparent substrate 31, a color filter 30 arranged on the second
transparent substrate 31 at a location corresponding to the black
matrix 32, a second planarization layer 37 formed on the second
transparent substrate 31, the black matrix 32, and the color filter
30, a common electrode 36 formed on the second planarization layer
37, a second alignment layer 38 formed on the common electrodes 36,
and a spacer layer 39 formed on the second alignment layer 38.
[0048] The second transparent substrate 31 can be a glass substrate
or a plastic substrate and is preferably a glass substrate in the
instant embodiment.
[0049] The black matrix 32 functions to shield light so as to make
the sites where lights are not supposed to transmit black.
[0050] In the instant embodiment, the color filter 30 comprises a
red filter 33, a green filter 34, and a blue filter 35 that are
arranged to juxtapose each other. The black matrix 32 and the gate
lines 22 and the data lines 23 collectively divide the color liquid
crystal display panel into a plurality of pixels.
[0051] The common electrode 36 is preferably made of indium tin
oxides. The second alignment layer 38 is a horizontal alignment
layer. The second alignment layer 38 realizes alignment by means of
rubbing alignment or photo alignment. The common electrode 26, the
second planarization layer 37, and the second alignment layer 38
are all formed by means of masking processes.
[0052] The second alignment layer 38 has an alignment direction
that defines an included angle with respect to an alignment
direction of the first alignment layer 28. The included angle is
greater than 0.degree. and less than 180.degree. and the included
angle is preferably 90.degree.. The second alignment layer 38 and
the first alignment layer 28 makes the liquid crystal molecules 42
and the dichroic dye molecules 44 forming a nematic twisted
arrangement at an initial condition and the twisting angle is
greater than or equal to 90.degree.. In other words, with no
driving voltage applied to the first substrate 2 (the thin-film
transistor array substrate) and the second substrate 3 (the package
substrate), the liquid crystal molecules 42 and the dichroic dye
molecules 44 both show a twisted arrangement of 90.degree. or more
than 90.degree. and have aligning angles at multiple directions, as
shown in FIG. 5 or 6.
[0053] The dye-doped liquid crystal layers 4 each comprise a liquid
crystal material, a chiral dopant, and at least one dichroic dye.
Each of the dichroic dyes absorbs a light of a predetermined
wavelength range.
[0054] The liquid crystal material is a positive nematic liquid
crystal material. In the instant embodiment, the dye-doped liquid
crystal layers 4 preferably comprise three dichroic dyes. The three
dichroic dyes respectively a dichroic dye that absorbs a light of
red wavelength range, a dichroic dye that absorbs a light of green
wavelength rang, and a dichroic dye that absorbs a light of blue
wavelength range. The absorption spectra of the three dichroic dyes
cover the entire spectrum of visible light. Correspondingly, the
plurality of pixels comprises: a plurality of red pixels, a
plurality of green pixels, and a plurality of blue pixels.
[0055] Referring to FIGS. 5-6, which demonstrate the principle of
color displaying with the color liquid crystal display panel of the
present invention, in the instant embodiment, the dye-doped liquid
crystal layers comprise three dichroic dyes, which are respectively
a dichroic dye that absorbs a light of red wavelength range, a
dichroic dye that absorbs a light of green wavelength rang, and a
dichroic dye that absorbs a light of blue wavelength range. The
absorption spectra of the three dichroic dyes cover the entire
spectrum of visible light. Except the absorption spectra are
different, these different dichroic dyes are of similar molecular
structures and properties.
[0056] The liquid crystal material comprises liquid crystal
molecules 42 and the dichroic dyes comprise dichroic dye molecules
44. The dichroic dye molecules 44 has a molecular structure similar
to a molecular structure of the liquid crystal molecules 42. The
dichroic dye molecules 44 have a property of selective absorption
of the visible light. When a visible light travels in a direction
parallel to a major axis of the dichroic dye molecules 44, the
dichroic dye molecules 44 generally show no absorbability of the
visible light; and when a visible light travels in a direction
perpendicular to the major axis of the dichroic dye molecules 44,
the dichroic dye molecules 44 show strong absorbability of the
visible light. Thus, through controlling the included angle between
the dichroic dye molecules 44 and a light emitting from a backlight
source (not shown), the extent that the light emitting from the
backlight source can be absorbed by the dichroic dye molecules 44
can be adjusted so as to provide an effect of adjusting
transmitting light intensity and achieve the purposes of displaying
various grey levels.
[0057] As shown in FIG. 5, when no driving voltage is applied to
the first substrate 2 and the second substrate 3, the first
alignment layer 28 and the second alignment layer 38 that are of
horizontal alignment make the liquid crystal molecules 42 and the
dichroic dye molecules 44 forming a nematic twisted arrangement of
an angle of 90.degree. or more than 90.degree. and show aligning
angles at multiple directions. Under this condition, the dichroic
dye molecules 44 show absorbability of a light 61 that gets
vertically incident to a surface of the first substrate 2 and the
second substrate 3 and has the greatest absorption extent. Light
that is not absorbed is allowed to pass through the color filter 30
to generate a predetermined color light 62 so as to achieve color
displaying of the liquid crystal display panel.
[0058] As shown in FIG. 6, when a driving voltage is applied to the
first substrate 2 and the second substrate 3, under the action of
an electric field, the liquid crystal molecules 42 and the dichroic
dye molecules 44 start to rotate and the rotation angle thereof can
be adjusted by controlling the level of the driving voltage
applied. When the driving voltage applied to the first substrate 2
and the second substrate 3 reaches a predetermined level, the
liquid crystal molecules 42 and the dichroic dye molecules 44
become aligned in a direction substantially perpendicular to a
surface of the first substrate 2 or the second substrate 3. Under
this condition, since the liquid crystal molecules 42 generally do
not absorb visible light and since the dichroic dye molecules 44
generally do not absorb the light 61 emitting from the backlight
source due to the major axis of the dichroic dye molecules 44 being
substantially parallel to the traveling direction of the light
emitting from the backlight source, when the driving voltage
applied to the first substrate 2 and the second substrate 3 reach a
predetermined level, mostly of the light 61 emitting from the
backlight source is allowed to transmit through the liquid crystal
display panel, thereby the entire liquid crystal display panel
showing a bright state.
[0059] Referring to FIG. 7, with additional reference to FIGS. 2-4,
the present invention also provides a manufacturing method of a
liquid crystal display panel, which comprises the following
steps:
[0060] Step 1: providing the first substrate 2, wherein the first
substrate 2 is a thin-film transistor array substrate.
[0061] The first substrate 2 comprises a first transparent
substrate 21, a plurality of gate lines 22 formed on the first
transparent substrate 21, a plurality of data lines 23 formed on
the first transparent substrate 21, an array of thin-film
transistors 25 formed on the first transparent substrate 21, an
insulation layer 24 formed on the array of thin-film transistors
25, the data lines 23, and the first transparent substrate 21,
pixel electrodes 26 formed on the insulation layer 24, a first
planarization layer 27 formed on the pixel electrodes 26 and the
insulation layer 24, and a first alignment layer 28 formed on the
first planarization layer 27.
[0062] The first transparent substrate 21 can be a glass substrate
or a plastic substrate and is preferably a glass substrate in the
instant embodiment.
[0063] The thin-film transistors each 25 comprises a gate terminal
g, a source terminal s, and a drain terminal d. The gate terminals
g are electrically connected to the gate lines 22. The source
terminals s are electrically connected, through vias, to the data
lines 23. The drain terminals d are electrically connected to the
pixel electrodes 26. The pixel electrodes 26 are preferably made of
indium tin oxides. The first alignment layer 28 is a horizontal
alignment layer and the first alignment layer 28 realizes alignment
by means of rubbing alignment or photo alignment. The gate lines 22
and the pixel electrodes 26 partially overlap each other to form
storage capacitors. The pixel electrodes 26, the first
planarization layer 27, and the first alignment layer 28 are all
formed by means of masking processes.
[0064] Step 2: dropping a mixture comprising a liquid crystal
material, a chiral dopant, and at least one dichroic dye on the
first substrate 2 to form dye-doped liquid crystal layers 4,
wherein each of the dichroic dyes absorbs a light of a
predetermined wavelength range.
[0065] The dye-doped liquid crystal layers 4 each comprise a liquid
crystal material, a chiral dopant, and at least one dichroic dye.
Each of the dichroic dyes absorbs a light of a predetermined
wavelength range.
[0066] The liquid crystal material is a positive nematic liquid
crystal material. In the instant embodiment, the dye-doped liquid
crystal layers 4 preferably comprise three dichroic dyes. The three
dichroic dyes respectively a dichroic dye that absorbs a light of
red wavelength range, a dichroic dye that absorbs a light of green
wavelength rang, and a dichroic dye that absorbs a light of blue
wavelength range. The absorption spectra of the three dichroic dyes
cover the entire spectrum of visible light.
[0067] Step 3: providing a second substrate 3, wherein the second
substrate 3 is a package substrate and the second substrate 3
comprises a second transparent substrate 31, a black matrix 32
formed on the second transparent substrate 31, and a color filter
30 arranged on the second transparent substrate 31 and
corresponding to the black matrix 32.
[0068] The second substrate 3 further comprises a second
planarization layer 37 formed on the black matrix 32 and the color
filter 30, a common electrode 36 formed on the second planarization
layer 37, a second alignment layer 38 formed on the common
electrodes 36, and a spacer layer 39 formed on the second alignment
layer 38.
[0069] The second transparent substrate 31 can be a glass substrate
or a plastic substrate and is preferably a glass substrate in the
instant embodiment.
[0070] The black matrix 32 functions to shield light so as to make
the sites where lights are not supposed to transmit black.
[0071] In the instant embodiment, the color filter 30 comprises a
red filter 33, a green filter 34, and a blue filter 35 that are
arranged to juxtapose each other. The black matrix 32 and the gate
lines 22 and the data lines 23 collectively divide the color liquid
crystal display panel into a plurality of pixels. Correspondingly,
in the instant embodiment, the plurality of pixels comprises: a
plurality of red pixels, a plurality of green pixels, and a
plurality of blue pixels.
[0072] The common electrode 36 is preferably made of indium tin
oxides. The second alignment layer 38 is a horizontal alignment
layer. The second alignment layer 38 realizes alignment by means of
rubbing alignment or photo alignment. The common electrode 26, the
second planarization layer 37, and the second alignment layer 38
are all formed by means of masking processes.
[0073] The second alignment layer 38 has an alignment direction
that defines an included angle with respect to an alignment
direction of the first alignment layer 28. The included angle is
greater than 0.degree. and less than 180.degree. and the included
angle is preferably 90.degree.. The second alignment layer 38 and
the first alignment layer 28 makes the liquid crystal molecules and
the dichroic dye molecules forming a nematic twisted arrangement at
an initial condition and the twisting angle is greater than or
equal to 90.degree.. In other words, with no driving voltage
applied to the first substrate 2 (the thin-film transistor array
substrate) and the second substrate 3 (the package substrate), the
liquid crystal molecules and the dichroic dye molecules both show a
twisted arrangement of 90.degree. or more than 90.degree. and have
aligning angles at multiple directions.
[0074] Step 4: coating a sealant on a surface of the second
substrate 3 to form a sealant frame 6.
[0075] The sealant frame 6 functions to hermetically seal the
second substrate 3 and the first substrate 2.
[0076] Step 5: coating an electrically conductive resin 8 on the
second substrate 3 at a location around and outside the sealant
frame 6.
[0077] The electrically conductive resin 8 enables external
electrons to flow into the dye-doped liquid crystal layers 4.
[0078] Step 6: laminating the second substrate 3 and the first
substrate 2 together in a vacuum environment and subjecting the
sealant frame to curing so as to hermetically seal the dye-doped
liquid crystal layers 4 between the first substrate 2 and the
second substrate 3. In the instant embodiment, UV curing or thermal
curing is adopted to cure the sealant frame.
[0079] In summary, the present invention provides a color liquid
crystal display panel and a manufacturing method thereof, wherein
at least one dichroic dye is added in a liquid crystal material so
as to use selective absorbability of the dichroic dye with respect
to visible lights to adjust light intensity and also to achieve
color displaying through collaboration of a color filter and the
dichroic dye, whereby there is no need to include a conventionally
used polarizer so as to reduce the manufacturing cost of the color
liquid crystal display panel, also reduce the requirement for
backlighting brightness, enhance light transmittal and optical
efficiency, and thus lower down energy consumption of the operation
of a color liquid crystal display.
[0080] Based on the description given above, those having ordinary
skills of the art may easily contemplate various changes and
modifications of the technical solution and technical ideas of the
present invention and all these changes and modifications are
considered within the protection scope of right for the present
invention.
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